本論文主要在探討外商投資，特別是與國有企業合資，對國有企業經營機制轉換及其經營績效的改善有何影響。新制度經濟學者，Williamson(1991)認為，當制度環境變化時(這些環境的變化包括:產權、政治、法律、及不確定性等)，會降低組織結構的轉換成本，因而會改善企業經營機制。本論文把外商與國有企業的合資看成產權結構的變化也就是制度環境的變化，外商投資可以降低國有企業改造(建立公司治理結構或企業現代化)的成本，因而會導致國有企業經營機制的轉換。另外，國有企業和外商合資之後，會援用較先進之外商的管理方式來建立對其經營績效改善有益的企業治理結構。本文應用的就是組織再造理論來探討其問題。 雖然相關的研究發現，外商投資對國有企業的經營機制轉換有影響，但是用一些具體的理論來說明其內涵的研究並不多。因此，本研究想對此問題進一步利用計量方法，研究外商投資對國有企業經營機制的轉換有何影響，即外商與國有企業合資之後，國有企業產權的變化對其企業組織形式有何改變，探討中外合資企業中外資對其經營績效改善的影響程度。 從實證模型的迴歸分析結果發現，有外資投入的國有企業的經營績效比沒有外資投入的國有企業的經營績效高；國有企業與外商合資經營企業的經營績效比未利用外資的國有企業經營績效高，因此可推論合資企業的經營機制較佳。這表示，外商投資使國有經濟達到以產權明晰化為條件的資源最優配置，有助於解決國有企業綜合低效益問題。 本文研究得到的結論為外商投資對國有企業經營績效之改善有顯著的效果，究其原因主要有三，一是國有企業有龐大的社會負擔，二是國有企業冗員太多，人力資源運用效率較差，三是國有企業的經營機制不佳。外商投資帶給國有企業現代企業管理知識、技術，建立較佳的企業經營制度，因而合資企業經營績效較好。 關鍵字：中國大陸、國有企業、經營績效、外資投入、外商投資、新制度經濟學、交易成本、組織再造 / This study mainly discuss about foreign direct investment (FDI) in mainland China, especially the influence of the joint venture (JV) of FDI and state-owned enterprises (SOE) on the change of management mechanism and management performance of SOE. New Institutional Economist Williamson (1991) said, when the institutional environment (including property right, politics, laws and uncertainty) is changed, the transaction cost of organization will be reduced. In this study, consider JV of foreign enterprises and SOE as a change of the property right which is the change of institutional environment. FDI can reduce the cost of enterprises’ reform and it causes the change of management system of SOE. After SOE and foreign enterprise’s JV, Chinese company will adopt a relatively advanced foreign company’s organization structure to build its’ organization structure that is effective for the management performance. And Reengineering theory is used to explain their adjustment of organization structure. The result of regression analysis shows that the management performance of JV is much better than SOE without foreign investment. Therefore, we can infer the management system of JV is better than SOE’s management system. It shows that foreign investment can make property right of SOE more clearly and effective resource allocation which is helpful for resolving SOE’s low economic effectiveness. The conclusion of this study is that FDI is remarkably effective for the improvement of SOE’s management performance. There are three reasons to this: first, SOE has a great amount of social responsibility; second, SOE has too much labor, so it has low effectiveness of human resource management; third, SOE has a bad management system. FDI can bring modern knowledge of management, new technology, and can build an effective management system, therefore we can say the management performance of JV is relatively good. Key words: mainland China, state-owned enterprise (SOE), management performance, foreign direct investment (FDI), New Institutional Economics, transaction cost, Reengineering